My Team

We are committed to helping our clients whether they are concerned for their own financial needs or those of their family or business. Here you will find a list of the people who help make it happen.

Together, we stand committed to providing the best customer service possible. If you have a problem or need assistance at any time, please let us know.

James M. Siegel

James M. Siegel, CFP®

Wealth Management Advisor
Office 281-583-4344

Jimmy was born and raised in Houston, Texas and attended Texas A&M University. After four years in College Station, he convinced his college sweetheart to move to Houston with him to start a career and a family. The rest is history!

Jimmy and wife Leslie have two boys, Tripp and Jaxson. Jaxson has special needs, and because of that they are both very passionate about various organizations and initiatives that impact special needs families.  

In his spare time, Jimmy enjoys CrossFit, playing golf, and spending time with his family.


Matthew E Assunto

Matthew E Assunto

Associate Financial Representative
Mobile 832-330-6855

Matthew was born and raised in Houston, Texas. Matthew has worked in the financial services industry for six years and joined Northwestern Mutual in 2020. Matthew graduated from the University of St. Thomas with a BBA in finance after serving in the United States Marine Corps from 2006-2011.

Matthew and his wife Jessica live in Houston with their son, Bradley. In his spare time, Matthew enjoys gardening, playing golf, and spending time with his family.

Zach Alaoui

Zach Alaoui, CFP®, CLTC®

Associate Wealth Management Advisor
Office 281-760-4812
Mobile 817-773-7693

Zach attended Texas State University and graduated in 2015 with a Bachelor of Business Administration and majored in Finance. After graduating he entered the Financial Planning industry and has since been with Northwestern Mutual for 5+ years. During that time, he has acquired his CERTIFIED FINANCIAL PLANNER™ professional and Certification in Long-Term Care designations. Zach began his career focusing on the insurance side of financial planning but has since expanded to becoming a comprehensive financial planner.

Outside of work, Zach enjoys spending time outdoors fishing, hunting, playing golf and spending time with his girlfriend of 4+ years Alli and his basset hound, Beau.

Allison Smith

Allison Smith

Director of New Business
Office 281-760-4803

Allison is originally from Orange County, California. She studied at Chapman University, graduating with a degree in Business Administration with an emphasis in International Business. Allison began her career with Northwestern Mutual in 2016 as Director of Client Services and has since transitioned into the role of Director of Operations.

Allison moved to Houston in 2014, and after meeting her now husband who is in the oil and gas industry, she knew that Houston was going to be their forever home. When Allison has free time, she is spending it with her husband Ian, daughter Peyton and their dog - Dexter, along with family and friends.

Nitzia Mangold

Nitzia Mangold

Director of Client Services
Mobile 281-995-3082

Nitzia is our Director of Insurance Operations and Services. She has many years of experience in the insurance/financial industry and holds the Texas Life and Health Insurance License. Nitzia began her career with Northwestern Mutual in 2002 and has had several roles including Associate Financial Representative, Client Relations Coordinator, and New Business Processor for our Houston Network Office. As family is priority for Nitzia, she understands the value of helping provide a solid financial future for families.

Nitzia lives in Katy, Texas with her husband, Steve, and daughter, Alexa. Nitzia's husband is also in the financial services industry which is how they met. Nitzia enjoys running, reading and volunteering.

Nitzia is David's Director of New Business and Client Service. She manages David's personal production as well as servicing existing clients and their insurance and financial needs.



David Alan Higgins

Aspire Wealth Advisors


To learn more about Northwestern Mutual Investment Services, LLC and its financial representatives, visit: FINRA BrokerCheck